> Some standards allow for in-phase and quadrature current
to be measured separately
The output of the speed controller gives the torque command [T.sup.*.sub.e] that uses to obtain the quadrature current [i.sup.*.sub.qs] using (5).
To compute the slip speed [[omega].sub.sl], the quadrature current [i.sup.*.sub.qs] and the motor parameters are employed based on (8).
There is an impulse to direct current error [e.sub.d]; however, convergence is fast; in addition, the direct current error [e.sub.d] and quadrature current error [e.sub.q] are very small.
Without reactive power compensation the source current's power angle is equal to the load current's, and there is an impulse to quadrature current error [e.sub.d].
This quantity illustrates the dependence degree of the algorithm to the measurement, namely direct current and quadrature current of the stator:
As it is seen, these states include direct current and quadrature current of the stator, direct flux linkage and quadrature flux linkage of the rotor, and rotor speed.
The circuit provides two explicit quadrature current outputs and two quadrature voltage outputs, simultaneously.
To the best of author's knowledge, no single active element oscillator is proposed till date that simultaneously provides explicit quadrature current outputs and buffered voltage outputs, without using external voltage buffers.
The quadrature current
[I.sub.q] and the inphase current [I.sub.ip] are applied to the PIN diodes.
Then, the control of IPMSM is simplified and the equation of torque and quadrature current becomes linear.
Load torque estimation is highly desired by adding a component to compensate the quadrature current component [i.sub.q].